package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree(){

        List<CategoryEntity> entities = baseMapper.selectList(null);

        List<CategoryEntity> categoryEntities = entities.stream().filter( categoryEntity -> {
            return  categoryEntity.getParentCid() == 0;
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getRoot(categoryEntity, entities));
            return categoryEntity; })
                .sorted((m1,m2)->{
                    return (m1.getSort()==null?0:m1.getSort()) - (m2.getSort()==null?0:m2.getSort());
                })
                .collect(Collectors.toList());
        return categoryEntities;
    }

    public List<CategoryEntity> getRoot(CategoryEntity root, List<CategoryEntity> entities){

        List<CategoryEntity> categoryEntities = entities.stream().filter(categoryEntity ->{
                return root.getCatId() == categoryEntity.getParentCid();})
                .map(categoryEntity -> {
             categoryEntity.setChildren(getRoot(categoryEntity, entities));
            return categoryEntity; })
                .sorted((m1,m2)->{
                    return (m1.getSort()==null?0:m1.getSort()) - (m2.getSort()==null?0:m2.getSort());
                })
                .collect(Collectors.toList());


        return categoryEntities;
    }
}
